Long Answer Type
 satisfy the condition 
 Evaluate the quantity 
Here
     
                            ...(1)
                                          
Adding (2), (3) and (4), we get
          
Short Answer TypeLet 
 be three vectors such that 
 and each one of them being perpendicular to the sum of the other two, find 
Long Answer Type
 then express 
 in the form 
 is perpendicular to 
Multiple Choice QuestionsLet 
 be two unit vectors and 
 be the angle between them. Then 
 is a unit vector if choose the correct answer.
Long Answer TypeShort Answer Type
 are unit vectors such that 
, then find the value of 
Switch
 is the angle between two vectors 
, then 
 only when 
